I am glad some of you already found about this.

for unbelievers  the ESC creates high frequency linear waves to the motor which in turn produces an audible confirmation tones and beeps. Wonder how a motor makes a sounds? The motor acts as an electromagnetic field and the high frequency waves are what we hear..crazy huh?

And those who said sound cant be made without a diaphragm

There is an amazing invention called plasma speaker.. Google it or look this video

Schematic for plasma speaker - http://www.instructables.com/files/deriv/FAT/15CV/FTY4CMXZ/FAT15CVFTY4CMXZ.MEDIUM.jpg

In fact, even I am under the strong impression that the motor makes the beeps.  If not, then try programming an ESC without connecting the motor.. There would be no beeps.. Logically, the ESC should beep whether the motor is connected or not.. Never seen an ESC beeping without a motor being connected..

 

This also reminds me of a comedy scene from a Tamil movie.. Do you snore thru your mouth or thru your nose??

- Chan

It is 100 Percent that the motor makes the beeps. It fact the turnigy ESC plays the whole start up/arming music(16 melody selectable) using the motor. I have 4 different kind/makes of ESCs and none have speaker. I was surprised the first time when I heard the sounds coming from the motor 2 months ago(when I first got hands on my first HC parcel.) A speaker is nothing but magnet, coil and diapharm. The motor is nothing but coil, magnet and a rotating body. Since the outrunners are AC motors and the signals can be sent over 3 wires in such a pattern so as to make the motor body vibrate in such a pattern that it creates that music. No big engineering here, but its pretty surprising .

What I have noted is that since there is no diapharm, a motor cannot sound as beautiful as a speaker and cannot make all frequency sounds. For example the same esc connected to a TP bell motor sounds loud and when connected to the turnigy non-bell motor sounds weak.

If you are still not satisfied that the motor makes the beeps, disconnect the motor and then try programming now(at your own risk, make sure that the ESC output wires are NOT touching each other.). You wont here any beeps.

Its fair that people not notice this because the ESC and motors are always near. 3 to 4 inch apart max and they think its ESC making sound.

EDIT:

Chan,

Its good that motor should make the beep and not ESC, because its the motor thats armed and rotates not the ESC. So more meaning full for motor beeping and reducing price of ESC by not putting a buzzer there.

Actually we see this all the time, but that alone does not indicate that it is the motor that makes the sound. It could just as easily be thought of as the ESC's way of indicating that a "motor is not connected". 

Agreed, but companies can always make a different tone/ tone pattern to say that a motor is not connected, rather than not making beeps at all in this case. You cannot program w/o beeps unless you have a programming card. And why do you think that ESCs company would if at all expect everyone connect ESC to motor and then program? One would always allow programming w/o connecting to motor, being more sensible here. So Personally I dont think its a way for ESC to tell that a motor is not connected. I rather consider it that motor make sound because its motor that gets armed and sound should come out of motor, also reducing cost of putting buzzer on ESCs

BTW are there ESCs that has a buzzer on it? I havent come across any.

I have seen ESCs with indicator lights, that can be used for programming.  That would have been a clue about the sound coming from motor, had one thought it through

hi to all members

thanks for u r valuable replys

i have understod that Motor Sound (Beeps) in Signal tone like beep--beep-----beep . It has some kind of pattern to beep, each beep indicates the meaning like set the throtter control, etc . After many trys i got the prop spin in full speed. thanks to all

but i m Sure that motor acts like speaker when it is connected to ESC, while the ESC is in Programmable mode

yes u can Programm u r ESC. U can configure the Throtter point from min to max. i have set the throtter in full range means, the stick of ur TX should be at the top point for maximum throtter and push the throtter at bottom for the minimum speed.

so it is right that ESC can be programmed by TX and the beep says that ur in programming mode.